In this task, you are given an article. Your task is to summarize the article in a sentence.

The vulnerability might leave users open to stalking, harassment or persecution, said the researchers.
By spoofing requests to the servers behind the apps, researchers were able to track people as they moved around during the day.
One app maker has fixed the loopholes in some nations but most users are still at risk, they warned.
The location-leaking vulnerabilities were found by Colby Moore and Patrick Wardle from cybersecurity firm Synack. The pair focused most of their attention on gay dating app Grindr but said other dating apps were vulnerable in the same way.
They found that they could exploit a feature of Grindr that tells users how far away they are from other people who have signed up to use the service and share where they are. The app calls on several different sources of data to provide very precise measurements of this distance.
To exploit the loophole the researchers sent several requests to servers behind Grindr, each one appearing to come from a different location. This let them get multiple estimates of a target's distance from these separate places. This made it possible to calculate a person's exact location by triangulation.
In a presentation at the Shmoocon conference, Mr Colby showed how he was able to use the loophole to map all Grindr users in San Francisco's Bay Area and those at the Sochi winter Olympics. Correlating this location data with information from social media sites would make it easy to find out someone's identity, he said.
While exploiting the loophole was not straightforward, said the researchers, there was evidence that it was being abused in Egypt to harass some dating app users.
He said Synack had told Grindr about the vulnerability which prompted the firm to update versions of its app available in nations where homosexuality is illegal or which have a history of violence against gay people.
It added that it had made it easy for people to stop sharing their location if they were worried about how it could be abused.
In a blogpost published soon after it was told about the problem, Grindr said that it had no plans to change the location finding system in nations where it was used because it was a "core function" of the service rather than a security flaw.
As a result, Mr Moore told tech news site Ars Technica, the problem still existed for Grindr users outside nations where location sharing was turned off.
"We were able to replicate this attack multiple times on willing participants without fail," he said.
He said Grindr could make it much harder to exploit the bug by checking where people were making location requests from and stopping those that were obviously spoofed. In addition, he said, the firm could make the location data less precise to help obscure people's locations.
Many mobile dating apps can be hacked to expose the exact location of users, warn security experts.

Firefighters were called to the former site of the Drumpark Primary School in Coatbridge Road, Coatbridge, at about 07:00.
The school - which caters for children with special needs - has since been relocated to Albert Road where it merged with Greenhill Primary School.
A thick plume of black smoke could be seen from the M8.
A fire has broken out at a disused primary school in North Lanarkshire.

After winning the toss and putting India in to bat on a green-tinged surface at The Oval, England took five wickets before lunch and bowled the tourists out for 148.
A spirited 82 from Mahendra Dhoni saved the tourists from total ignominy, the captain hauling his side from 90-9 in a last-wicket partnership of 58 with Ishant Sharma.
But England, leading the series 2-1, cemented their advantage with an unbroken opening partnership of 62-0 to close just 86 runs behind.
Sam Robson, who has not scored a fifty since the first innings of the first Test, struck two confidence-boosting cover drives on his way to 33, while Alastair Cook has 24.
The England captain should have been given out lbw on nine by umpire Paul Reiffel when he missed a Bhuvneshwar Kumar outswinger, but it is symptomatic of the transformation in both teams' fortunes over the course of the series that he survived with his hopes of ending a 30-innings wait for a century intact.
Cook will resume in the morning confident in helping his team take another stride towards a third victory in a row to complete a remarkable turnaround since they were heavily beaten at Lord's to go 1-0 down in the series.
While the hosts appear to improving with every match - there were three wickets apiece on Friday for seamers Chris Woakes and Chris Jordan - India are in freefall.
For the fourth innings in a row, they failed to reach 200 as their batsman failed to cope with the moving ball.
"To bowl them out for under 150 is fantastic, and with the way the boys batted at the end, it was a great day for England," Woakes told BBC Sport.
"It was nice to bowl on a wicket that was a little bit helpful to the seamers. Jimmy Anderson and Stuart Broad set the tone perfectly as they have done for the whole series, so it was nice to back them up and pick up a few wickets."
In the previous Test at Old Trafford, Dhoni walked out to bat with his team on 8-4. On Friday, India had managed 28 runs before he confronted another crisis.
After rain delayed the start of play by half an hour, it only took four balls for James Anderson to land the first blow on a desperately fragile India.
Left-hander Gautam Gambhir attempted to leave a ball shaping away from him but got the toe-end of his bat on the ball and presented a routine catch to wicketkeeper Jos Buttler.
Cheteshwar Pujara and Virat Kohli have been billed as the natural successors to India legends Rahul Dravid and Sachin Tendulkar, but both are enduring miserable series, with only one half-century between them in 18 innings.
Stuart Broad, playing only six days after his nose was broken by a Varun Aaron bouncer at Old Trafford, bowled Pujara via his pad and arm, while Kohli was lbw shouldering arms to Jordan.
Ajinkya Rahane tamely served up a return catch to Jordan and a near-perfect morning session for the hosts was rounded off when Murali Vijay was caught by Joe Root in the gully for 18 to leave India in a mess on 43-5.
The afternoon session brought a same old story as Stuart Binny, recalled in place of Ravindra Jadeja, nicked an Anderson outswinger to slip, Woakes accounted for Ravichandran Ashwin and Aaron, and Jordan had Kumar caught behind.
India should have been bowled out for 95, but Ian Bell, diving to his right, shelled a sharp chance to his right at second slip to reprieve Ishant.
Sensing the need to accelerate, Dhoni went into limited-overs mode either side of tea, most notably when driving Jordan for long-off for six.
However, with a century in his sights, he hooked Broad to Woakes at long leg.
Despite the captain's efforts, it had been another feeble India batting display and one that may have sealed their fate in the series.
Listen to Geoffrey Boycott and Jonathan Agnew review the day's play on the Test Match Special podcast.

England's resurgence continued with another devastating bowling display in helpful conditions on day one of the final Test against India.

